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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'facf35107a634cc4e91ac80aaf9a2f189c63997624b9ab18e0fc8980903a0d3f' 
  AND token = 'q2rIICvdTgwNDYulToiAT1CUi22XbKabxTO7AJbydc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}